ci: use stable branch instead tags (#1771)

* ci: use latest branch instead tags

* Create branch if it does not exist

* chore: for testing purposes

* Revert "chore: for testing purposes"

This reverts commit 2310c66.

* Exclude the branch from the MBP

* Use stable instead latest

Author: v1v

.ci/jobs/apm-agent-java-mbp.yml

@@ -13,6 +13,7 @@
             discover-pr-forks-trust: permission
             discover-pr-origin: merge-current
             discover-tags: true
+            head-filter-regex: '^(?!stable).*$'
             notification-context: 'apm-ci'
             repo: apm-agent-java
             repo-owner: elastic

Jenkinsfile

@@ -315,7 +315,11 @@ pipeline {
         dir("${BASE_DIR}"){
           setupAPMGitEmail(global: false)
           sh(label: "checkout ${BRANCH_NAME} branch", script: "git checkout -f '${BRANCH_NAME}'")
-          gitCreateTag(tag: 'stable', tagArgs: '--force', pushArgs: '--force')
+          sh(label: 'rebase stable', script: """
+            git rev-parse --quiet --verify stable && git checkout stable || git checkout -b stable
+            git rebase '${BRANCH_NAME}'
+          """)
+          gitPush()
         }
       }
     }